I worked in Rawlins some but never lived besides a week or two in a time. Cant answer your school question to much with the school system there. Went to school in Casper (Although bigger city) they had the autistic kids going to school with us. Most of the time they had there own classes and own teachers but they wanted to mix them in with the other students to I believe. I cant speak again for Rawlins but here the students mixed in great with them and they was just part of the gang so to say. The best bet would be to contact the school system there in Rawlins and talk to them in person instead of getting info from anyone but the horses mouth.
Carbon County School System Web site
www-rawlins.crb1.k12.wy.us
And there is a phone number that might help or they would be able to get you pointed in the right direction.
Hope your move goes great and love Wyoming!!! It will be a great teaching aid for you also with your son!!!!!